18 Modern American Universities Before the 1850's, the United States had a number of small colleges, most of them dating ...
实用英语 网络资源 Freekaoyan.com 2008-04-1217 Evolution of Sleep Sleep is very ancient. In the electroencephalographic sense we share it with all the primates and ...
实用英语 网络资源 Freekaoyan.com 2008-04-1219 Children's Numerical Skills People appear to be born to compute. The numerical skills of children develop so early an ...
实用英语 网络资源 Freekaoyan.com 2008-04-1220 The Historical Significance of American Revolution The ways of history are so intricate and the motivations of human ...
实用英语 网络资源 Freekaoyan.com 2008-04-1221 The Origin of Sports When did sport begin? If sport is, in essence, play, the claim might be made that sport is much ...
实用英语 网络资源 Freekaoyan.com 2008-04-1222 Collectibles Collectibles have been a part of almost every culture since ancient times. Whereas some objects have bee ...
实用英语 网络资源 Freekaoyan.com 2008-04-1223 Henry Ford Although Henry Ford's name is closely associated with the concept of mass production, he should receive eq ...
实用英语 网络资源 Freekaoyan.com 2008-04-1224 Piano The ancestry of the piano can be traced to the early keyboard instruments of the fifteenth and sixteenth centur ...
实用英语 网络资源 Freekaoyan.com 2008-04-1225 Movie Music Accustomed though we are to speaking of the films made before 1927 as "silent", the film has never been, ...
实用英语 网络资源 Freekaoyan.com 2008-04-1226 International Business and Cross-cultural Communication The increase in international business and in foreign investm ...
实用英语 网络资源 Freekaoyan.com 2008-04-1227 Scientific Theories In science, a theory is a reasonable explanation of observed events that are related. A theory of ...
实用英语 网络资源 Freekaoyan.com 2008-04-1228 Changing Roles of Public Education One of the most important social developments that helped to make possible a shift ...
实用英语 网络资源 Freekaoyan.com 2008-04-1229 Telecommuting Telecommuting -- substituting the computer for the trip to the job -- has been hailed as a solution to ...
实用英语 网络资源 Freekaoyan.com 2008-04-1230 The Origin of Refrigerators By the mid-nineteenth century, the term"icebox"had entered the American language, but ice ...
实用英语 网络资源 Freekaoyan.com 2008-04-1231 British Columbia British Columbia is the third largest Canadian province, both in area and population. It is nearly 1 ...
实用英语 网络资源 Freekaoyan.com 2008-04-1232 Botany Botany, the study of plants, occupies a peculiar position in the history of human knowledge. For many thousand ...
实用英语 网络资源 Freekaoyan.com 2008-04-1233 Plankton Scattered through the seas of the world are billions of tons of small plants and animals called plankton. Mo ...
实用英语 网络资源 Freekaoyan.com 2008-04-1234 Raising Oysters In the past oysters were raised in much the same way as dirt farmers raised tomatoes - by transplanti ...
实用英语 网络资源 Freekaoyan.com 2008-04-1235 Oil Refining An important new industry, oil refining, grew after the Civil War. Crude oil, or petroleum -- a dark, th ...
实用英语 网络资源 Freekaoyan.com 2008-04-1236 Plate Tectonics and Sea-floor Spreading The theory of plate tectonics describes the motions of the lithosphere, the c ...
实用英语 网络资源 Freekaoyan.com 2008-04-1237 Icebergs Icebergs are among nature's most spectacular creations, and yet most people have never seen one. A vague air ...
实用英语 网络资源 Freekaoyan.com 2008-04-1238 Topaz Topaz is a hard, transparent mineral. It is a compound of aluminum, silica, and fluorine. Gem topaz is valuable ...
实用英语 网络资源 Freekaoyan.com 2008-04-1239 The Salinity of Ocean Waters f the salinity of ocean waters is analyzed, it is found to vary only slightly from place ...
实用英语 网络资源 Freekaoyan.com 2008-04-1240 Cohesion-tension Theory Atmospheric pressure can support a column of water up to 10 meters high. But plants can move ...
实用英语 网络资源 Freekaoyan.com 2008-04-1241 American Black Bears American black bears appear in a variety of colors despite their name. In the eastern part of th ...
实用英语 网络资源 Freekaoyan.com 2008-04-1242 Coal-fired Power Plants The invention of the incandescent light bulb by Thomas A. Edison in 1879 created a demand for ...
实用英语 网络资源 Freekaoyan.com 2008-04-1243 Statistics There were two widely divergent influences on the early development of statistical methods. Statistics had ...
实用英语 网络资源 Freekaoyan.com 2008-04-1244 Obtaining Fresh Water from Icebergs The concept of obtaining fresh water from icebergs that are towed to populated ar ...
实用英语 网络资源 Freekaoyan.com 2008-04-1245 The Source of Energy A summary of the physical and chemical nature of life must begin, not on the Earth, but in the S ...
实用英语 网络资源 Freekaoyan.com 2008-04-1246 Vision Human vision like that of other primates has evolved in an arboreal environment. In the dense complex world of ...
实用英语 网络资源 Freekaoyan.com 2008-04-1247 Folk Cultures A folk culture is a small isolated, cohesive, conservative, nearly self-sufficient group that is homoge ...
实用英语 网络资源 Freekaoyan.com 2008-04-1248 Bacteria Bacteria are extremely small living things. While we measure our own sizes in inches or centimeters, bacteri ...
实用英语 网络资源 Freekaoyan.com 2008-04-1249 Sleep Sleep is part of a person's daily activity cycle. There are several different stages of sleep, and they too occ ...
实用英语 网络资源 Freekaoyan.com 2008-04-1250 Cells and Temperature Cells cannot remain alive outside certain limits of temperature, and much narrower limits mark ...
实用英语 网络资源 Freekaoyan.com 2008-04-1251 Marine Mammals Since there is such an abundance of food in the sea, it is understandable that some of the efficient, ...
实用英语 网络资源 Freekaoyan.com 2008-04-1252 Chimpanzee The most striking single fact about chimpanzees is the flexibility of their social life, the lack of any r ...
实用英语 网络资源 Freekaoyan.com 2008-04-1253 Nitinol Nitinol is one of the most extraordinary metals to be discovered this century: A simple alloy of nickel and t ...
实用英语 网络资源 Freekaoyan.com 2008-04-1254 Treasure in Sunken Ships Of the tens of thousands of ships on the ocean bottom, only a handful, less than 1 percent, ...
实用英语 网络资源 Freekaoyan.com 2008-04-1255 Creating Colors There are two ways to create colors in a photograph. One method, called additive, starts with three b ...
实用英语 网络资源 Freekaoyan.com 2008-04-1256 The Organic Foods Are organically grown foods the best food choices? The advantages claimed for such foods over conve ...
实用英语 网络资源 Freekaoyan.com 2008-04-1257 Lighthouses The first navigational lights in the New World were probably lanterns hung at harbor entrances. The first ...
实用英语 网络资源 Freekaoyan.com 2008-04-1258 Animals' Compasses Researchers have found that migrating animals use a variety of inner compasses to help them naviga ...
实用英语 网络资源 Freekaoyan.com 2008-04-1259 Muscles and Human Body It is in the joints of the human body that movements of the bones take place. The movement its ...
实用英语 网络资源 Freekaoyan.com 2008-04-1260 Colds and Age A critical factor that plays a part in susceptibility to colds is age. A study done by the University o ...
实用英语 网络资源 Freekaoyan.com 2008-04-1261 Pottery Ancient people made clay pottery because they needed it for their survival. They used the pots they made for ...
实用英语 网络资源 Freekaoyan.com 2008-04-1262 Mimicry in Plants Plant adaptations can be remarkably complex. Certain species of orchids, for instance, imitate fema ...
实用英语 网络资源 Freekaoyan.com 2008-04-1263.oil and waterto understand the emulsifying process, we must first accept the scientific principle that oil and water ...
实用英语 网络资源 Freekaoyan.com 2008-04-1264 Salt and Metabolism Just how salt became so crucial to our metabolism is a mystery; one appealing theory traces our d ...
实用英语 网络资源 Freekaoyan.com 2008-04-1265 The Early Settlers in North America The North American frontier changed some of the characteristics of the pioneers o ...
实用英语 网络资源 Freekaoyan.com 2008-04-1266 Plants in the Deserts Some cacti, like the saguaro, grow to tree size, but true trees need more moisture than most de ...
实用英语 网络资源 Freekaoyan.com 2008-04-12
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